Vacuum cleaner



April 2, 1935. M. TREPPENHAUER VACUUM CLEANER Filed July 14, 1932 .70 venfap," Ma v ka levers, the rings Patented Apr. 2, 1935 vacuum CLEANER Martin Treppenhauer, Dresden, Germany Application July 14, 1932, serial No. 622,563

In Germany January 2, 1932 2 Claims. (01. 15-11) This invention relates to a hand-operated vacuum cleaner fitted with apump piston.

A highly important feature in vacuum cleaners quired in operation to a minimum. types comprise a cylinder having a wooden valve bottom inserted therein and a movable piston formed by a wooden disc. The use of wooden discs increases the weight of the cleaner and its length, and it often happens, furthermore, that the wooden parts swell up and become jammed.

the known types of cleaners is very small, so that these valves, owing to their smallness, cannot let much air pass and the handling of the cleaner requires therefore greater efforts, though its efliciency is very low.

According to the invention, these defects are eliminated by forming the piston and the valve bottom of the vacuum cleaner from metal, artificial rosin, or the like.

By employing sheet metal in the manufacture of these parts the weight of the latter is lowered and their overall length reduced.

To insure good packing of the piston relative to the cylinder a leather packing is preferably provided on the circumference of the piston, and closely hugs the cylinder walls.

An improvement achieved by the invention deals with the arrangement of the bearing parts for the operating handles which, together with the holding members for the front closing cap of the suction cylinder, are disposed in a common double link positioned. on the outside of the cylinder. In the known devices special rings were required for placing therein the operating beng arranged around the suction cylinder whereby the weight of the cleaner was increased.

One form of the invention is illustrated in the accompanying drawing, in which Figure 1 is a general view of the device, partly in section; Fig. 2, a side view thereof; Figs. 3 and .4 are, respectively, a side view and a top view of the double link; Fig. 5 is a longitudinal section or the device. and Fig. 6, a top view of a part of the valve bottom.

Referring to the drawing, I is the suction cylinder made either of metal or of artificial rosin, or the like, to save weight. The top of the cylinder I is fitted with the hood 2 in which the piston rod 4 is guided by means of the member 3. The lower side of the cylinder is covered by the cap 5 between which and the edges of the cylinder I the dust bag 8 is secured. The cap 5 has means of two levers 8 piston rod 4 possesses the air passages an opening for the pipe 1 which connects the suction cylinder with the mouthpiece.

The vacuum cleaner is operated by hand by and 8' movably disposed on two sides of the cylinder I and connected with g the piston rod 4 by the members 8 and 9' in such a way that when the levers 8 and 8' are spread apart the piston rod 4 and the piston working inside the cylinder I are pressed down while the piston is drawn up when the levers 8 and 8' 10 are moved towards one another.

'The levers 8 and 8' are connected with the double links III disposed on two sides on the outer circumference of the cylinder I. The

parts I8 are provided on their upper end with 15 the "bolts I I about which the levers 8 and 8' move, and on their lower end with the clamps I2, I3 which hold the cap 5, the member I2 being a holding clamp gripping the edge I4 of the cap 5 and the member I3 being a lever by the displace- 2o ment of which the clamp- I2 can-be moved away from the edge I4.

The parts III are screw 6. on to the wall of the cylinder I. To insure stability a support I5 is arranged inside the cylinder I, which connects 25 the two parts Ill and protects the cylinder I against being compressed by the operating levers 8 and 8' at their point of bearing. The support I5 may preferablyserve also as carrier for the valve bottom to render special bolting means so unnecessary.

Figs. 5 and 6 show the construction of the valve bottom and piston. The piston consists of a sheet metal part I8 provided with an annular depression of roof-like cross section. In the center of 35 the part I6 the piston rod 4 is secured by means of the nut l1. The wall of the part I8 facing the I8 which may be covered by the leather flaps I8 which, according to the invention, are secured to the part 40 I6 by the screw H, the flaps I8 being in covering position during the suction stroke. At its outer circumference the part I6 carries a leather packing ring '28 held in position by the clamping ring 2|.

22 is a protecting plate secured to the piston rod 4 above the piston I6 to prevent oil from dripping on the valves I8, I8.

The valve bottom rests on the support I5, and, like the piston, consists of a metal part 28 which is provided with an annular depression of 'rooflike cross section. The part 28 is secured to the support I5 by a bolt 24. 25 are air holes covered on their upper sides by the leather flaps 28 held in position by the bolt 24. 21 is a packing 8,5

ring between the bottom 23.

The device functions as follows:

Assumed that the piston I6 is in its uppermostposition, it will compress, during its descent, the air between the valve bottom 23 and itself, which causes the fiaps,26 to close the valves 25 in the valve bottom, th compressed air escaping through the openings it. Since a large number of openings l8 are provided, the piston can be moved without much efiort.

The descent of the piston is efl'ected by drawing apart the operating levers l, 8'. When the piston has reached its lowermost position, the operating levers I, 8' will be in their extreme position, whereupon they are drawn together again to cause the ascent of the piston IS, the flaps I9 closing at the same time the openings I8 and air Being drawn in through the openings 25 of the valve bottom while the flaps 26 are raised. The dust contained in the air is retained by the bag 6, and the air above the piston I 6 escapes through the openings 28 in the cap 2.

The piston rod 4 is guided by the member 3 made of a material which prevents remnants or lubricants from adhering to the piston rod 4 outside the cylinder I.

The root-like depression is inclined so that,

cylinder wall I and the valve during the descent of the piston IS the compressed air' will exert pressure in vertical direction on the flaps i9 and thus raise them to permit unchecked escape of the air through the open valves l8, IS. The same applies to the valve bottom 23 and the valves 25, 26.

I claim 1. In a hand-operated vacuum cleaner having a cylindrical suction chamber and a dust chamber divided by a valved bottom, a piston operating in the suction chamber, operating arms pivoted at opposite sides of said cylindrical chamlinks to the piston, a bottom tudinally oi and lying in contact with the cleaner and having upper and lower ends, said operating arms being articulated to the upper ends of said holding means for moving the piston, and

holding clamps for said bottom cap at the lower ends of said holding means.

2. In a hand-operated vacuum cleaner according to claim 1, a support crossing the interior of the cylinder and connecting the holding means 'on the outside ofthe cylinder and carrying the valve bottom.

MAR'I'IN 'I'REP'PENHAUER. 

